package com.example.securityredis.filter;

import com.example.securityredis.Domain.LoginUser;
import com.example.securityredis.Utils.JwtUtil;
import com.example.securityredis.Utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

/**
 * ┏┓　　　┏┓
 * ┏┛┻━━━┛┻┓
 * ┃　　　　　　　┃
 * ┃　　　━　　　┃
 * ┃　┳┛　┗┳　┃
 * ┃　　　　　　　┃
 * ┃　　　┻　　　┃
 * ┃　　　　　　　┃  @Auther: wangshenghui
 * ┗━┓　　　┏━┛    @Date: 2022/09/28/14:28
 * 　　┃　　　┃神兽保佑
 * 　　┃　　　┃代码无BUG！
 * 　　┃　　　┗━━━┓
 * 　　┃　　　　　　　┣┓
 * 　　┃　　　　　　　┏┛
 * 　　┗┓┓┏━┳┓┏┛
 * 　　　┃┫┫　┃┫┫
 * 　　　┗┻┛　┗┻┛
 *
 */
//@Component
//public class JWTAuthenticationTokenFilter extends OncePerRequestFilter {
//
//    @Autowired
//    private RedisCache redisCache;
//
//
//    @Override
//    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
//
////        获取token
//        String token = httpServletRequest.getHeader("token");
//        if(!StringUtils.hasText(token)){
//            filterChain.doFilter(httpServletRequest,httpServletResponse);
//            return;
//        }
//        String userid;
////        解析 token parseJWT
//        try {
//            Claims claims = JwtUtil.parseJWT(token);
//            userid = claims.getSubject();
//        } catch (Exception e) {
//            e.printStackTrace();
//            throw new RuntimeException("token解析失败");
//        }
//        //从redis中提取用户信息
//        String redisKey = "login:" + userid;
//        LoginUser loginUser = redisCache.getCacheObject(redisKey);
//        if(Objects.isNull(loginUser)) {
//           throw new RuntimeException("用户未登录");
//        }
//
//        //存入SecurityContextHolder
//
//        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());
//        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
//        // 放行
//        filterChain.doFilter(httpServletRequest,httpServletResponse);
//
//
//    }
//
//}
@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        //获取token
        String token = request.getHeader("token");
        if (!StringUtils.hasText(token)) {
            //放行
            filterChain.doFilter(request, response);
            return;
        }
        //解析token
        String userid;
        try {
            Claims claims = JwtUtil.parseJWT(token);
            userid = claims.getSubject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("token非法");
        }
        //从redis中获取用户信息
        String redisKey = "login:" + userid;
        LoginUser loginUser = redisCache.getCacheObject(redisKey);
        if(Objects.isNull(loginUser)){
            throw new RuntimeException("用户未登录");
        }
        //存入SecurityContextHolder-+
        //TODO 获取权限信息封装到Authentication中
        UsernamePasswordAuthenticationToken authenticationToken =
                new UsernamePasswordAuthenticationToken(loginUser,null,loginUser.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        //放行
        filterChain.doFilter(request, response);
    }
}

